Boring-tool.



M. THOMAS.

BORING TOOL.

APPLICATION FILED JAN. 12, 1911.

1,002,787. 1 I Patehted Sept. 5, 1911.

10 9 51mm Marian 77mm as.

UNITED STATES PATENT OFFICE.

MARION THOMAS, OF GEORGETOWN, INDIANA.

BORING-TOOL.

Application filed January 12, 1911.

To all whom it may concern:

Be it known that I,- MARION THOMAS, a citizen of the United States,residing at Georgetown, in the county of Floyd, State of Indiana, haveinvented certain new and useful Improvements in Boring-Tools; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to an improvement in drilling bits and isespecially adapted for use in boring sockets in chair legs for thereception of the ends of the rounds. It is a well known fact thatconsiderable difficulty has been experienced in properly securing theends of the rounds to the chair legs.

The primary object of my invention is to provide an improved boring bitby means of which a flared seat may be formed by means of which the endof a round may be securely fastened therein.

Another object of the invention is to provide an improved cutter whichis in the nature of an attachment for the bit and may be readilydetached or attached to the bit shank whenever desired.

A still further object of the invention is to provide a boring toolwhich is composed of a minimum number of parts, is therefore simple inconstruction and is cheap to manufacture.

With these and other objects in View, the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawing, and pointed out in the claimshereto appended; it being understood that various changes in the form,proportion, size and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawing :Figure 1 is a front elevation of the tool, Fig. 2 is arear elevation thereof, Fig. 3 is a bottom plan view. of the tool, Fig.4: is a cross-sectional view taken 011 the line tt of Fig. 2, and Fig. 5is a sectional view through a chair leg showing my invention associatedtherewith in working position, Fig. 6 is a detail View of the cutter.

Like reference numerals indicate corresponding parts in all the figuresof the drawing.

Specification of Letters Patent.

Patented Sept. 5, 1911.

Serial No. 602,332.

V-shaped end wall 6 constituting a guide for a purpose hereinafterdescribed. The lower end of the shank projects downwardly and outwardlyfrom the said seat 6 to form a foot 8 and said foot is provided with theusual center point 9 and cutting blade 10.

Arranged within the seat 6 is a cutter 11 and this cutter is formed ofspring steel. The upper end 12 thereof is pointed and is adapted toengage the V-shaped end wall ("3 of said seat. This cutter normallyrests against the flange 7 and the opposite end thereof projects beyondthe seat and terminates in a cutting edge 13 which is disposed 111 aplane slightly below the cutting blade 10. This cutting edge is formedby tapering'the cutter outwardly, as indicated by the reference numeral1 1. This cutter is secured to the shank at its upper end by a pluralityof screws 15 or other suitable fastening means. It will thus be seenthat the cutter can be moved outwardly from the shank and that theflange 7 of said shank constitutes a shoulder against which the saidcutter may bear when the tool is rotated.

In operation as the tool is rotated the cutting edge 14: will be causedon account of its cutting edge to make a circular recess of its wn. Asthe tool is rotated the cutter will necessarily be forced away from theshank as the tool passes through the wood. This is due to the fact thatthe inner face of the cutting edge is inclined outwardly. It will bealso observed that as the tool is rotated the shoulder 7 will engage thelower end portion of the cutter and thereby materially assist the sameand likewise prevent any undue strain thereupon. Should the cutterbecome broken away from any cause the remaining portion can be quicklydctached from the shank and a new cutter inserted. When the tool iswithdrawn from an opening formed thereby, the spring cutter willimmediately resume its normal position against the shank and in positionto be gin work upon another flared opening. After the openings have thusbeen formed in a chair leg the round can be driven thereinto and a wedgeinserted in the rear of said round, thereby causing the ends thereof tosaid seat to form a foot having a center point and a cutt-ing blade, acutter formed of spring steel arranged within the said seat and againstthe shoulder and having its lower end projecting beyond the seat andterminating in a cutting edge disposed in a plane slightly below thecutting blade,

" and means for securing the upper end of the cutter to the shank.

2. A boring tool comprising in combination, a shank having alongitudinal seat and a consequent shoulder formed on one side thereof,said seat terminating near the upper end of the shank in a substantiallyV-shaped end wall, the lower end of the shank projecting downwardly andoutwardly from the said seat to form a foot having a center point and acutting blade, a cutter formed of spring steel arranged within said seatand against the shoulder, the upper end thereof being pointed to engagethe end wall of the said seat, and having its opposite end projectingbeyond the seat and terminating in a cutting edge disposed in a planeslightly below the said cutting blade, said edge being taperedoutwardly, and means for securing the upper end of the cutter to theshank.

In testimony whereof, I afiix my signature, in presence of twowitnesses.

MARION THOMAS. Witnesses WVM. A. BYERLEY, L. A. ENEGAR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

